20.500.12556/RUL-136758 Effect of water and salt on the colloidal stability of latex particles in ionic liquid solutions The colloidal stability of sulfate (SL) and polyimidazolium-modified sulfate (SL-IP-2) latex particles was studied in an ionic liquid (IL) of ethylammonium nitrate (EAN) and its water mixtures. Aggregation rates were found to vary systematically as a function of the IL-to-water ratio. Repulsive electrostatic interactions between particles dominated at low IL concentrations, while they were significantly screened at intermediate IL concentrations, leading to destabilization of the dispersions. When the IL concentration was further increased, the aggregation of latex particles slowed down due to the increased viscosity and finally, a striking stabilization was observed in the IL-rich regime close to the pure IL solvent. The latter stabilization is due to the formation of IL layers at the interface between particles and IL, which induce repulsive oscillatory forces. The presence of the added salt in the system affected differently the structure of the interfaces around SL and SL-IP-2 particles. The sign of the charge and the composition of the particle surfaces were found to be the most important parameters affecting the colloidal stability. The nature of the counterions also plays an important role in the interfacial properties due to their influence on the structure of the IL surface layers. No evidence was observed for the presence of long-range electrostatic interactions between the particles in pure ILs. The results indicate that the presence of even low concentrations of water and salt in the system (as undesirable impurities) can strongly alter the interfacial structure and thus, the aggregation mechanism in particle IL dispersions. ionic liquids aggregation latex particle light scattering colloidal stability ionske tekočine agregacija lateksni delci sipanje svetlobe koloidna stabilnost true false true Angleški jezik Slovenski jezik Članek v reviji 2022-05-19 14:26:45 2022-05-19 14:26:46 2022-09-15 04:14:17 0000-00-00 00:00:00 2022 0 0 14 str. iss. 1, art. 2 Vol. 6 Mar. 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 544.72 2504-5377 10.3390/colloids6010002 92287491 colloids-06-00002-v2.pdf colloids-06-00002-v2.pdf 1 499500090E37E35479AE7B20FA5D0B8E ed8ab3374e36b8c621f6eded8ec492b8ca13c6a3bac37d5abc8cc578792611fa 0bbbdcd7-d76f-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=156533 https://www.mdpi.com/2504-5377/6/1/2 0 d46e61e9-d76e-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=156532 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0